Refinement of the microstructure of light alloys using ultrasonic and laser processing

Todaro, C 2019, Refinement of the microstructure of light alloys using ultrasonic and laser processing, Doctor of Philosophy (PhD), Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title Refinement of the microstructure of light alloys using ultrasonic and laser processing
Author(s) Todaro, C
Year 2019
Abstract The transport sector represents 20 pct of all greenhouse gas emissions globally. The use of aluminum (Al) to reduce vehicle weight offers the potential to reduce these emissions. The production of secondary Al from recycled products requires only ~2.8 kWh kg 1 compared to ~45 kWh kg 1 for primary Al production. In addition, recycling emits only ~5 pct as much carbon dioxide as primary production. Hence, the environmental advantages of using recycled Al for transport applications are as attractive as the economic savings. Unfortunately, the properties of recycled Al alloys do not meet the necessary requirements due to the unavoidable introduction of iron (Fe) impurity that leads to the occurrence of harmful Fe containing intermetallic compounds (IMCs). This thesis aims to establish the knowledge required to be able to increase the utilization of recycled Al by controlling the formation of the Fe containing IMCs by ultrasonic melt treatment (USMT). In addition, USMT was further extended to laser additive manufacturing (LAM) to explore its applicability for structural refinement.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Engineering
Subjects Manufacturing Engineering not elsewhere classified
Keyword(s) Al alloys
Intermetallic compounds
Ultrasound
Laser processing
Solidification processing
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Created: Mon, 30 Mar 2020, 13:04:08 EST by Keely Chapman
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